Ok, this is because the directory /www mounted read-only.mount -o remount, rw
had no effect, then I tried to copy all files from /www whith saving all permission to /jffscp -rp /www /jffs/www
and mount it with startup script in the original /wwwmount -o noatime /jiffs/www /www
but it only broke the web interface with errors "503 read access error"
Does anyone have experience ssh connection without file known_hosts, or adding it to nvram router?
Thanks for reading and sorry for my terrible english.